Marked Rats

For more rat genetics, see the AFRMA Rat Genetics book, specific articles listed with the various standards descriptions, and the articles on the Info Pages: Breeding – Colors/Genetics – Rat Genetics, part 1, Rat Genetics, part 2, Rat Genetics, part 3. See also the Rat Biology article Why do some rats have white blazes and megacolon?
See the AFRMA Rat Color Standards book and the Standards pages for photos.

Go to Fancy Rat Genes, Alphabetical Name Listing for a complete list.

Go to Fancy Rat Genes, Agouti-based Colors,
Fancy Rat Genes, Black-based Colors, or
Fancy Rat Genes, Coats & Misc.

See also Fancy Rat Genes, Genetic Code Listing for breakdowns by genetic code.

A  B  C  D  E  H  I  M  R  S  T  V  W

Marked Rats
A
Albino	cc (covers up the actual color/marking so can be either an agouti-based or black-based color; a.k.a. P.E. White)
B
Baldie	Hro++h?
Banded	? (from Hooded stock)
Bareback	hh or hhe or hHms or hhi?
Berkshire	Hh or hhe or hihi or hihn
Blaze	many possible
C
Capped	hnhn
Capped-Stripe	hreh; Hrehre (lethal)?
Collared	? (usually from Dalmatian breedings) or Heh? or Hehi?
D
Dalmatian	Daldal*
Down Under	hdu? (dominant)
E
English Irish	Hh, or Hhi if no Hooded produced in 2 Irish breedings
Essex	Hro++ or Hro++H (color fading gene; has Berkshire markings but breeds as a Self)
H
Hooded	hh or hml (Hm=Hooded Modifier; hms or hml—short or long)
I
Irish	Hh, or Hhi if no Hooded produced in 2 Irish breedings
M
Masked	hehe
R
Roan (Husky)	? (recessive; roan gene lightens color with each moult till rat is nearly white; always in Berkshire or Berkshire Blaze markings)
Roan: Striped	? (recessive; a.k.a. Banded Husky)
S
Snowflake	? (small white spots belly and sides; a.k.a. stippeltjes in the Netherlands which means dots)
T
Tri-Merle	heh Me?
V
Variegated	? (2 Var. never produce Self or Hooded)
W
White: black-eyed	hehe or any h (marked selected for no spots; in either agouti-based or black-based color) Note: could also be slsl (Spotting Lethal); these suffer from aganglionic megacolon associated with white coat color, usually BEW but occasionally have small spot on head and hips and die usually within first week to 35 days after birth
White: pink-eyed	cc (albino; covers up the actual color/marking so can be either an agouti-based or black-based color) Note: extremely diluted P.E. Self colors or a P.E. Marked with all markings bred off can look like a P.E. White

Note: Many rat colors/varieties have not been studied by geneticists so codes are given by fancy rat genetics experts or are unknown

Note: Capital letter=dominant genes unless otherwise noted; lower case letter=recessive genes

“–” means that either the dominant or recessive allele could occupy that space without affecting the outcome

* = g or Me or Dal code by Nichole Royer

** = Cscs Fyfy code by Ann Storey, N.F.R.S.

+ = c^e or cⁱ code by Nichole Royer

++ = H^ro code by Sheila Sowter, N.F.R.S.

# = c^m or c^s code by Nicole Housel

? = genetics unknown

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